Furthest from a listed building

There are almost 20,000 listed buildings in London, from palaces to pubs and parish churches to phone kiosks. They're particularly prevalent in inner London because that's where most of the old stuff is, and somewhat sparser towards the outskirts. There are also a few larger gaps where nothing's been listed, these generally suburbs in former agricultural areas where nothing old was noteworthy and nothing newer has proved architecturally significant. Today's question is thus... Where in London is furthest from a listed building? Thankfully Historic England provide a scrollable map on which every listed building is pinpointed, so I started there. This is a snapshot from northeast London, where you can see lots of listed buildings in the lower left-hand corner in Hackney, Tower Hamlets and Greenwich, and rather fewer as you continue outwards. A lot of these can be found along main roads because that's where settlement and commerce began, leaving several listed voids inbetween. I hope…

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